Ecaml.OverlaySourceOverlays modify the appearance of a buffer's text, for presentation's sake.
(Info-goto-node "(elisp)Overlays")
(describe-function 'make-overlay)
(describe-function 'overlay-start)
(describe-function 'overlay-end)
(describe-function 'move-overlay)
(describe-function 'overlay-get)
(describe-function 'overlay-put)
(describe-function 'overlays-at)
val remove_overlays :
?start:Position.t ->
?end_:Position.t ->
?with_property:('a Text.Property_name.t * 'a) ->
unit ->
unit(describe-function 'remove-overlays). (Info-goto-node "(elisp)Managing Overlays")
(describe-function 'overlays-in)